とりあえずメモリを埋めたい人用

extreme.cpp

#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>

#define BLOCK_SIZE 1048576U

uint32_t xor128(void);

int main(void) {
	uint32_t count = 0;
	printf("started!\n");
	printf("block size is %dbyte\n", BLOCK_SIZE);
	do {
		uint8_t *np;
		np = (uint8_t*) malloc(BLOCK_SIZE);
		if (np == NULL) {
			printf("failed!\n");
			uint64_t all = BLOCK_SIZE * count;
			printf("%lldbytes memory allocated\n", all);
			return -1;
		}
		for(int i = 0; i < BLOCK_SIZE; i++) {
			uint32_t rp = xor128() % BLOCK_SIZE;
			*(np + rp) = xor128() & 0xff;
		}
		count++;
		printf("%dblocks allocated!\n", count);
	} while(count);
	
	return 0;
}


uint32_t xor128(void) { 
  static uint32_t x = 123456789;
  static uint32_t y = 362436069;
  static uint32_t z = 521288629;
  static uint32_t w = 88675123; 
  uint32_t t;
 
  t = x ^ (x << 11);
  x = y; y = z; z = w;
  return w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)); 
}